package com.qingcheng.service.impl;
import com.alibaba.dubbo.config.annotation.Service;
import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.qingcheng.dao.SkuMapper;
import com.qingcheng.entity.PageResult;
import com.qingcheng.pojo.goods.Sku;
import com.qingcheng.pojo.order.OrderItem;
import com.qingcheng.service.goods.SkuService;
import com.qingcheng.util.CacheKey;
import org.apache.http.HttpHost;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.transaction.annotation.Transactional;
import tk.mybatis.mapper.entity.Example;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service(interfaceClass =SkuService.class )
public class SkuServiceImpl implements SkuService {
    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private SkuMapper skuMapper;

    /**
     * 返回全部记录
     * @return
     */
    public List<Sku> findAll() {
        return skuMapper.selectAll();
    }

    /**
     * 分页查询
     * @param page 页码
     * @param size 每页记录数
     * @return 分页结果
     */
    public PageResult<Sku> findPage(int page, int size) {
        PageHelper.startPage(page,size);
        Page<Sku> skus = (Page<Sku>) skuMapper.selectAll();
        return new PageResult<Sku>(skus.getTotal(),skus.getResult());
    }

    /**
     * 条件查询
     * @param searchMap 查询条件
     * @return
     */
    public List<Sku> findList(Map<String, Object> searchMap) {
        Example example = createExample(searchMap);
        return skuMapper.selectByExample(example);
    }

    /**
     * 分页+条件查询
     * @param searchMap
     * @param page
     * @param size
     * @return
     */
    public PageResult<Sku> findPage(Map<String, Object> searchMap, int page, int size) {
        PageHelper.startPage(page,size);
        Example example = createExample(searchMap);
        Page<Sku> skus = (Page<Sku>) skuMapper.selectByExample(example);
        return new PageResult<Sku>(skus.getTotal(),skus.getResult());
    }

    /**
     * 根据Id查询
     * @param id
     * @return
     */
    public Sku findById(String id) {
        return skuMapper.selectByPrimaryKey(id);
    }

    /**
     * 新增
     * @param sku
     */
    public void add(Sku sku) {
        skuMapper.insert(sku);
    }

    /**
     * 修改
     * @param sku
     */
    public void update(Sku sku) {
        skuMapper.updateByPrimaryKeySelective(sku);
    }

    /**
     *  删除
     * @param id
     */
    public void delete(String id) {
        skuMapper.deleteByPrimaryKey(id);
    }

    @Override
    public void saveAllPriceToRedis() {
        //判断缓存中是否有数据
        if(!redisTemplate.hasKey(CacheKey.SKU_PRICE)){
            //缓存中什么都没有
            List<Sku> skus = skuMapper.selectAll();
            //遍历
            for (Sku sku : skus) {
                if("1".equals(sku.getStatus())){
                    redisTemplate.boundHashOps(CacheKey.SKU_PRICE).put(sku.getId(),sku.getPrice());
                }
            }
        }else {
            System.out.println("已存在价格数据，但是并没有全部加载");
        }
    }

    @Override
    public Integer findPrice(String id) {
        Integer price = (Integer) redisTemplate.boundHashOps(CacheKey.SKU_PRICE).get(id);
        return price;
    }

    @Override
    public void deletePriceFromRedis(String id) {
        redisTemplate.boundHashOps(CacheKey.SKU_PRICE).delete(id);
    }

    /**
     * 将商品信息导入到ES中
     */
    @Override
    public void importToEs() {
        //1.建立连接
        HttpHost httpHost =new HttpHost("127.0.0.1",9200,"http");
        RestClientBuilder builder = RestClient.builder(httpHost);
        RestHighLevelClient restHighLevelClient=new RestHighLevelClient(builder);

        if(countEs(restHighLevelClient)>0){
            System.out.println("已存在索引数据");
            return;
        }

        System.out.println("开始准备索引库数据");
        Map map=new HashMap(  );
        map.put( "status","1" );
        int pageNo=1;
        while(true){
            System.out.println("page:"+pageNo);
            PageResult page = findPage( map, pageNo, 1000 );
            List<Sku> skuList = page.getRows();
            if(skuList.size()>0){
                importSkuListToEs(restHighLevelClient,skuList);
            }else{
                break;
            }
            pageNo++;
        }
        System.out.println(".....索引库数据完成");


    }
    /**
     * 根据购物车批量扣减库存
     * @param oderItemList
     */
    @Override
    @Transactional
    public boolean deductionStock(List<OrderItem> oderItemList) {
        //检查是否可以扣减库存
        boolean isDeduction=true;//是否可以删除，默认为可以
        //循环List对象
        for (OrderItem orderItem : oderItemList) {
            //获取该商品对象
            Sku sku = findById(orderItem.getSkuId());
            //没有该商品，不能扣减
            if (sku==null){
                isDeduction=false;
                break;//跳出循环
            }
            //未上架的商品不能扣除
            if(!"1".equals(sku.getStatus())){
                isDeduction=false;
                break;
            }
            //商品库存小于订单销售数量，不能扣除
            if( sku.getNum().intValue()<orderItem.getNum().intValue() ){
                isDeduction=false;
                break;
            }

        }

        //执行扣减
        if(isDeduction){
            //循环扣除
            for (OrderItem orderItem : oderItemList) {
                //扣除库存
                skuMapper.deductionStock(orderItem.getSkuId(),orderItem.getNum());
                //增加销量
                skuMapper.addSaleNum(orderItem.getSkuId(),orderItem.getNum());
            }
        }
        return isDeduction;
    }

    @Override
    public void savePriceToRedisById(String id, Integer price) {
        redisTemplate.boundHashOps(CacheKey.SKU_PRICE).put(id,price);
    }
    /**
     * 计算当前数据条数
     * @param restHighLevelClient
     * @return
     */
    private long countEs(RestHighLevelClient restHighLevelClient ){
        //2.封装查询请求
        SearchRequest searchRequest=new SearchRequest("sku");
        searchRequest.types("doc"); //设置查询的类型
        SearchSourceBuilder searchSourceBuilder=new SearchSourceBuilder();
        searchRequest.source(searchSourceBuilder);
        //3.获取查询结果
        SearchResponse searchResponse = null;
        try {
            searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        } catch (IOException e) {
            e.printStackTrace();
            return -1;
        }
        SearchHits searchHits = searchResponse.getHits();
        long totalHits = searchHits.getTotalHits();
        System.out.println("记录数："+totalHits);
        return totalHits;
    }

    /**
     * 将sku列表导入索引库
     * @param restHighLevelClient
     * @param skuList
     */
    private void  importSkuListToEs(RestHighLevelClient restHighLevelClient  ,List<Sku> skuList ){
        //2.构建BulkRequest
        BulkRequest bulkRequest = new BulkRequest();
        for (Sku sku : skuList) {
            IndexRequest indexRequest = new IndexRequest("sku", "doc", sku.getId().toString());
            Map skuMap=new HashMap();
            skuMap.put("name",sku.getName());
            skuMap.put("brandName",sku.getBrandName());
            skuMap.put("categoryName",sku.getCategoryName());
            skuMap.put("image",sku.getImage());
            skuMap.put("price",sku.getPrice());
            skuMap.put("createTime",sku.getCreateTime());
            skuMap.put("saleNum",sku.getSaleNum());
            skuMap.put("commentNum",sku.getCommentNum());
            skuMap.put("spec", JSON.parseObject(sku.getSpec(),Map.class) );
            indexRequest.source(skuMap);
            bulkRequest.add(indexRequest);
        }
        System.out.println("开始导入索引库");
        //异步调用方式
        restHighLevelClient.bulkAsync(bulkRequest, RequestOptions.DEFAULT,  new ActionListener<BulkResponse>() {
            public void onResponse(BulkResponse bulkResponse) {
                //成功
                System.out.println("导入成功"+bulkResponse.status());
            }
            public void onFailure(Exception e) {
                e.printStackTrace();
                //失败
                System.out.println("导入失败"+e.getMessage());
            }
        });
        System.out.println("导入完成");
    }

    /**
     * 构建查询条件
     * @param searchMap
     * @return
     */
    private Example createExample(Map<String, Object> searchMap){
        Example example=new Example(Sku.class);
        Example.Criteria criteria = example.createCriteria();
        if(searchMap!=null){
            // 商品id
            if(searchMap.get("id")!=null && !"".equals(searchMap.get("id"))){
                criteria.andLike("id","%"+searchMap.get("id")+"%");
            }
            // 商品条码
            if(searchMap.get("sn")!=null && !"".equals(searchMap.get("sn"))){
                criteria.andLike("sn","%"+searchMap.get("sn")+"%");
            }
            // SKU名称
            if(searchMap.get("name")!=null && !"".equals(searchMap.get("name"))){
                criteria.andLike("name","%"+searchMap.get("name")+"%");
            }
            // 商品图片
            if(searchMap.get("image")!=null && !"".equals(searchMap.get("image"))){
                criteria.andLike("image","%"+searchMap.get("image")+"%");
            }
            // 商品图片列表
            if(searchMap.get("images")!=null && !"".equals(searchMap.get("images"))){
                criteria.andLike("images","%"+searchMap.get("images")+"%");
            }
            // SPUID
            if(searchMap.get("spuId")!=null && !"".equals(searchMap.get("spuId"))){
                criteria.andLike("spuId","%"+searchMap.get("spuId")+"%");
            }
            // 类目名称
            if(searchMap.get("categoryName")!=null && !"".equals(searchMap.get("categoryName"))){
                criteria.andLike("categoryName","%"+searchMap.get("categoryName")+"%");
            }
            // 品牌名称
            if(searchMap.get("brandName")!=null && !"".equals(searchMap.get("brandName"))){
                criteria.andLike("brandName","%"+searchMap.get("brandName")+"%");
            }
            // 规格
            if(searchMap.get("spec")!=null && !"".equals(searchMap.get("spec"))){
                criteria.andLike("spec","%"+searchMap.get("spec")+"%");
            }
            // 商品状态 1-正常，2-下架，3-删除
            if(searchMap.get("status")!=null && !"".equals(searchMap.get("status"))){
                criteria.andLike("status","%"+searchMap.get("status")+"%");
            }

            // 价格（分）
            if(searchMap.get("price")!=null ){
                criteria.andEqualTo("price",searchMap.get("price"));
            }
            // 库存数量
            if(searchMap.get("num")!=null ){
                criteria.andEqualTo("num",searchMap.get("num"));
            }
            // 库存预警数量
            if(searchMap.get("alertNum")!=null ){
                criteria.andEqualTo("alertNum",searchMap.get("alertNum"));
            }
            // 重量（克）
            if(searchMap.get("weight")!=null ){
                criteria.andEqualTo("weight",searchMap.get("weight"));
            }
            // 类目ID
            if(searchMap.get("categoryId")!=null ){
                criteria.andEqualTo("categoryId",searchMap.get("categoryId"));
            }
            // 销量
            if(searchMap.get("saleNum")!=null ){
                criteria.andEqualTo("saleNum",searchMap.get("saleNum"));
            }
            // 评论数
            if(searchMap.get("commentNum")!=null ){
                criteria.andEqualTo("commentNum",searchMap.get("commentNum"));
            }

        }
        return example;
    }

}
